Metallic seal for an underwater luminaire



FIG. 1 is a perspective view of a metallic seal, showing my new design;

FIG. 2 is a left side view thereof, the right side being a mirror image thereof;

FIG. 3 is a front elevational view thereof; and,

FIG. 4 is a rear elevational view thereof. 

The ornamental design for a metallic seal for an underwater luminaire, as shown and described. 